secretary of state hillary clinton will not testify at this week's congressional hearings about that benghazi report as originally planned. that's because she is recovering from a concussion. clinton sustained the injury after she fainted during a bout with a stomach flu. she's moner toed by doctors who recommended she take the week off. >>> president obama appears ready to nominate senator john kerry as hillary clinton's successor. a democrat who spoke with cnn tells us that kerry announcement could come as early as this week. kerry is the chairman of the senate foreign relations committee. many of his senate colleagues on both sides of the aisle have expressed support for him and he's likely to easily win confirmation as secretary of state. back to candy crowley in newtown. candy? >> thanks, dana. coming up, 20 years ago, she learned firsthand about gun violence. >> i came into congress because a tragedy had happened to my family and to others on the railroad, and when my son was learning how to talk again, you know, he asked me how this could happen. i didn't have the answer. and that's wh